Let’s suppose you wish to allocate time in your diary for an activity. Perhaps you’ve been trying to find time to improve your programming skills, or just to have time to read for pleasure. If you use Google Calendar then you can use the goal-setting function to whiz through your diary on your phone and find suitable times for you.
I’ve written an article about how to do this. It’s aimed at writers, but it will, of course, apply to any activity.